Observation of ultrafast interfacial Meitner-Auger energy transfer in a Van der Waals heterostructure.

ABSTRACT: Atomically thin layered van der Waals heterostructures feature exotic and emergent optoelectronic properties. With growing interest in these novel quantum materials, the microscopic understanding of fundamental interfacial coupling mechanisms is of capital importance. Here, using multidimensional photoemission spectroscopy, we provide a layer- and momentum-resolved view on ultrafast interlayer electron and energy transfer in a monolayer-WSe₂/graphene heterostructure. Depending on the nature of the optically prepared state, we find the different dominating transfer mechanisms: while electron injection from graphene to WSe₂ is observed after photoexcitation of quasi-free hot carriers in the graphene layer, we establish an interfacial Meitner-Auger energy transfer proces

SUBMITTER: Dong S 

PROVIDER: S-EPMC10439896 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature